Valuable guidelines for making Sound Design demo reel

I’ve just finished reading “Guidelines for Making a Sound Design Demo Reel“, a blog post in audiocookbook.org by Kyle Vande Slunt. He shares how he created his sound design demo reel. This is very useful since I’ve never known anything about this before. There’re a lot of websites/blogs mention about making portfolio for graphic and web designer, also the making of visual FX & motion graphic demo reel. But none of them mention sound design demo reel.